Developer forum

Hi DW,

As the title states, calling /dwapi/ecommerce/products/{productId}?FilledProperties=StandardFields gives this error (i've attached it as a picture aswell for better readability):

{
    "Message": "An error has occurred.",
    "ExceptionMessage": "The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; charset=utf-8'.",
    "ExceptionType": "System.InvalidOperationException",
    "StackTrace": null,
    "InnerException": {
        "Message": "An error has occurred.",
        "ExceptionMessage": "Error getting value from 'StandardFields' on 'Dynamicweb.Ecommerce.ProductCatalog.ProductViewModel'.",
        "ExceptionType": "Newtonsoft.Json.JsonSerializationException",
        "StackTrace": "   at Newtonsoft.Json.Serialization.DynamicValueProvider.GetValue(Object target)\r\n   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CalculatePropertyValues(JsonWriter writer, Object value, JsonContainerContract contract, JsonProperty member, JsonProperty property, JsonContract& memberContract, Object& memberValue)\r\n   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)\r\n   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType)\r\n   at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType)\r\n   at System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, Encoding effectiveEncoding)\r\n   at System.Net.Http.Formatting.JsonMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, Encoding effectiveEncoding)\r\n   at System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.WebHost.HttpControllerHandler.<WriteBufferedResponseContentAsync>d__1b.MoveNext()",
        "InnerException": {
            "Message": "An error has occurred.",
            "ExceptionMessage": "Object reference not set to an instance of an object.",
            "ExceptionType": "System.NullReferenceException",
            "StackTrace": "   at Dynamicweb.Ecommerce.ProductCatalog.ViewEngine.GetStandardFieldValues(ProductViewModelSettings settings, Product product)\r\n   at Dynamicweb.Ecommerce.ProductCatalog.ViewEngine.<>c__DisplayClass3_1.<BulkCreateView>b__49()\r\n   at System.Lazy`1.CreateValue()\r\n   at System.Lazy`1.LazyInitValue()\r\n   at Dynamicweb.Ecommerce.ProductCatalog.ProductViewModel.get_StandardFields()\r\n   at GetStandardFields(Object )\r\n   at Newtonsoft.Json.Serialization.DynamicValueProvider.GetValue(Object target)"
        }
    }
}

But just calling /dwapi/ecommerce/products/{productId} populates the StandardFields property correctly, so there's something in the FilledProperties query that goes wrong.
Looks like the method GetStandardFieldValues being called is missing.

Best regards,
Mikkel Hammer